Web front-end

Nearly every app requires an authorization system on top of an authentication system. We often need a fine-grained permissions model to allow only specific users to access certain resources while simultaneously restricting access for everyone else. In this tutorial, Toptal Freelance Firebase Developer Joaquin Cid teaches how to build just such a system. Called a role-based authentication, we’ll learn how to implement this system in an API using Node.js and Firebase.

Integration tests provide a lot of value considering the time and effort required for testing. React integration tests improve code maintainability, yet they don’t slow down development. In this article, Toptal Software Developer Anton Rublev demonstrates how you can harness the power of react-testing-library to create superior code without wasting time.

Five years after Dart 1.0, Google's rewritten open-source language is attracting increasing numbers of developers. What do C# and Java developers need to know to get started with it?

Are Vue.js, React, and Angular actually delivering a good developer and user experience, or are they used simply because they're the current de facto standard? Discover some exciting approaches to web development.

Rails 6 is finally here, featuring major improvements and clever new features that should make development easier and faster than ever. In this article, Toptal Ruby on Rails Developer Avant Mittal dives into the Rails 6 changelog to introduce you to these new features and explain how you will be using them in your next Rails project.

It's no secret that the WordPress codebase is a mess. Many developers use its legacy code as an excuse for writing sloppy code themselves, even if its newer additions follow best practices. If this is you, it's time to level up your skills!

In the past few years, we've seen the introduction of a lot of new technologies in JavaScript, but we needed time to see how the market was going to adopt them. In this article, Toptal Freelance JavaScript Developer Alejandro Hernandez takes a look at how popular JavaScript is becoming and the factors that may have affected this popularity, and he tries to predict what the future of JavaScript will look like.

There are a number of ways of implementing animated full-screen layouts with a large degree of human interaction, and many developers would resort to a JavaScript plugin to save time. In this article, Toptal JavaScript Developer Stefan Vitasovic demonstrates how you can do it using nothing but CSS and JavaScript, without including a bloated library or plugin in your project.